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Aviation Abbreviations And Acronyms

This listing is NOT an aviation dictionary or glossary. Select the first letter of the word from the list above to navigate to appropriate alphabetical area of the listing.


Terms beginning with A

A Autotuned NAVAID
A At or Above (constrained altitude)
AA American
AAATS Australian Advanced Air Traffic Services
AAC Aeronautical Administration Communication (a class of communication which supports administrative communication)
AAS Advanced Automation System (the end systems for all FAA air traffic control, located at the ARTCCs)
AATT Advanced Aviation Transportation Technology
ABM Abeam
A/C Aircraft
AC Air Canada
ACARS Aircraft Communications Addressing and Reporting System
ACARS ARINC communications and address reporting system (digital communications system used primarily for aircraft-to-airline messages)
ACARS MU ACARS Management Unit
ACAS Airborne Collision and Avoidance System
ACF Area Control Facility
ACFS Advanced Concepts Flight Simulator (a generic "glass cockpit")
ACK Acknowledge
ACMS Aircraft Condition Monitoring System
ACT Active
ADC Air Data Computer
ADF Automatic Direction Finder
ADI Attitude Director lndicator
ADLP Aircraft Data Link Processor (the Mode S subnetwork function onboard the aircraft that implements the OSI network layer protocols)
ADMA Aviation Distributors and Manufactureres Association
ADS Automatic Dependent Surveillance
AECB Atomic Energy Control Board
AERA Automated Enroute ATC
AFCS Automatic Flight Control System
AFDS Autopilot Flight Director System (also A/P F/D)
AFS Automatic Flight System
AGATE Advanced General Aviation Transport Experiments
AGL Above Ground Level
AHRS Attitude Heading Reference System
AIRS Advanced Infrared Sounder
A/l Anti-ice
AI Artificial Intelligence
AL Allegheny
Alert Indicator (visual or auditory) which provides information to the flightcrew in a timely manner about an event requiring pilot awareness.
ALPA Air Line Pilots Association
ALT Altitude
ALT Alternate
ALTN Alternate
ALT HOLD Altitude Hold Mode
AM Amplitude Modulation
AM Aeromexico
AMSS Aeronautical Mobile Satellite Service
ANA All Nippon Airways
AOA Angle-of-Attack
AOA Airport Operations Area
AOC Aeronautical Operation Control (communications which support safety and regularity of flight that normally take place between aircraft and the operator)
AOCS Attitude and Orbit Control System
AOM Aircraft Operating Manual
AOPA Aircraft Owners and Pilots Association
A/P Autopilot
APA Allied Pilots Association
APC Aeronautical Passenger Communication (a class of communication which supports passenger communication)
APMS Automated Performance Measurement System
APPR Approach/Approach Mode
APR April
APRT Airport
APU Auxiliary Power Unit
AQP Advanced Qualification Program
ARAC Aviation Rulemaking Advisory Committee
ARINC Aeronautical Radio Incorporated
ARPA Advanced Research Projects Agency
ARR Arrival
ARTCC Air Route Traffic Control Center
ARTS Automated Radar Terminal System
ASCII American Standard Code for Interface and Interchange
ASI Air Speed Indicator
ASR Airport Surveillance Radar
ASRS Aviation Safety Reporting System (aviation incident reporting system run by NASA for FAA)
AT At (an altitude)
A/T Autothrottle
ATA Air Transport Association
ATA Actual Time of Arrival
ATC Air Traffic Control (a generic term for a joint civil/military system for controlling traffic within a specific area)
ATCS Advanced Train Control Systems
ATCSCC Air Traffic Control System Command Center
ATHR Autothrust System
ATIS Automatic Terminal Information Service (recorded voice message that provides weather and airport services information)
ATM Air Transportation Management
ATN Aeronautical Telecommunications Network (the collection of ground subnetworks, air/ground subnetworks and airborne subnetworks interconnected by ATN routers that support computer-to-computer, internetwork communication and message transfer between host computers using the OSI ISO protocol architecture)
ATS Automatic Throttle System
ATSC Air Traffic Service Communications (Communications related to air traffic services. This includes ATC, aeronautical and meteorological information, position reporting and services related to safety and regularity of flight)
AUG August
AV Avianca
AVAIL Available
AVHRR Advanced Very High-Resolution Radiometer
AWACS Airborne Warning And Control System
AWAS Automated Weather Advisory Station
AWIPS Advanced Weather Interactive Processing System
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Terms beginning with B

B At or Below (constrained altitude)
BALPA British Air Line Pilots Association
BASIS British Airways Safety Information System
BF MarkAir
BIT(E) Built-ln-Test (Equipment)
BRG Bearing
BRT Brightness
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Terms beginning with C

C Centigrade
CAA Civil Aviation Authority (Great Britain)
CAB Civil Aeronautics Board
CAAC Civil Aviation Authority of China
CAS Calibrated (Computed) Air Speed
CASE Computer Aided Software Engineering
CAT Clear Air Turbulence
CAT Computer Aided Testing
CAT I Facility providing operation down to 200 feet decision height and runway visual range not less than 2600 feet.
CAT II Facility providing operation down to 100 feet decision height and runway visual range not less than 1200 feet.
CAT II a Facility providing operation with no decision height limit to and along the surface of the runway with external visual reference during final phase of landing and with a runway visual range not less than 700 feet.
CBT Computer Based Training
CDI Course Deviation Indicator
CDU Control display unit (pilots' interface to the FMS)
CDTI Cockpit Display of Traffic Information
CENA Centred' Études de la Navigation Aérienne (France)
CFIT Controlled Flight Into Terrain
CG Center of Gravity
CGS Centimeter-gram-second
Cl Cost Index
CI China Airlines
CIT Compressor Inlet Temperature
CLB Climb Detent of the Thrust Levers
CLR Clear
CMC Central Maintenance Computer
CNS Communications Navigations and Surveillance
CO Continetnal
COM Cockpit Operating Manual
CON Continuous
CO ROUTE Company Route (also CO RTE)
COTR Contracting Officer's Technical Representative
COTS Commercial Off The Shelf
CP Control Panel
CPCS Cabin Pressure Control System
CPDLC Controller Pilot Datalink Communications
CPU Central Processing Unit
CRC Cyclic Redundancy Check
CRITTER Civil Rotorcraft IFR Terminal-Area Technology Enhancement Research
CRM Cockpit Resource Management
CRM Crew Research Management
CRS Course
CRT Cathode Ray Tube
CRZ Cruise
CSD Constant Speed Drive
CTA Controlled-Time of Arrival
CTA Control Area (ICAO Term)
CTAS Center TRACON Automation System
CTC Centralized Train Central
CTR Center
CTR Civil Tilt Rotor
CTRL Control
CVSRF Crew-Vehicle Simulation Research Facility (NASA Ames)
CWS Control Wheel Steering
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Terms beginning with D

D Derated
DA Descent Advisor
DBS Direct Broadcast Satellite
DE-TO PR Derated Takeoff Engine Pressure Ratio
D-TO Nl Derated Takeoff Engine Fan Speed
DADC Digital Air Data Computer
DATALINK Digitized Information Transfer (air/ground)
DC Direct Current Electricity
D/D Drift Down
DEC December
DEC Digital Equipment Corporation
DECR Decrement
DEL Delete
DEP Departure
DES Descent
DEST Destination
DEV Deviation
DFDAU Digital Flight Data Acquisition Unit
DFDR Digital Flight Data Recorder
DFGS/C Digital Flight Guidance System/Computer
DFW Dallas Fort Worth International Airport
DGPS Differential GPS
DH Decision Height
DIR Direct
DIR/INTC Direct Intercept
DIS Distance
DISCR Discrepancy
DIST Distance
DL Delta
DLP Data Link Processor (the FAA's ground automation system that supports the Mode S subnetwork (GDLP), internetwork (ATN router) and non-ATC data link application processes)
DLR German Aerospace Research Establishment
DME Distance Measuring Equipment (ground navigational aid that can provide display of distance to selected ground navigational radio transmitter)
DMU Data Management Unit
DNTKFX DownTrack Fix
DOT Department of Transportation
DOD Department of Defense
DRU Data Retrival Unit
DSPY Display (annunciation on CDU)
DTG Distance-to-go
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Terms beginning with E

E East
EADI Electronic Attitude Director Indicator
EAS Equivalent Airspeed
ECAM Electronic Centralized Aircraft Monitor
ECON Economy (minimum cost speed schedule)
ECS Environmental Control System
E/D End-of-Descent
EDF Electricité de France
EEC Electronic Engine Control
EFC Expected Further Clearance
EFIS Electronic Flight Instrument System
EGT Exhaust Gas Temperature
EHSI Electronic Horizontal Situation Indicator
EICAS Engine Indicating Crew Alerting System
EIU Electronic Interface Unit
ELT Emergency Locator Transmitter
EMP Electromagnetic Pulse
EMS Emergency Medical Services
ENG Engine
E/O Engine-Out
EPR Engine Pressure Ratio
EPROM Erasable Programmable Read-Only Memory
EST Estimated
ETA EstimatedTime of Arrival
ETX End of Transmission
EXEC Execute
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Terms beginning with F

F Fahrenheit
FA Final Approach
FAA Federal Aviation Administration
FADEC Full Authority Digital Engine Control
Failure The inability of a system, subsytem, unit or part to perform within previously specified limits.
FAF Final Approach Fix
FANS Future Air Navigation Systems
FAR Federal Aviation Regulations (federal rules under which flight operations are conducted)
FAR Federal Acquisition Regulation
FAST Final Approach Spacing Tool
FBO Fixed Based Operator
FCC Flight Control Computer
FCU Flight Control Unit
F/D (FD) Flight Director
FDAMS Flight Data Acquisition and Management System
FDC Flight Data Company
FDR Flight Data Recorder
FEATS Future European Air Traffic System
FEB February
FF Fuel Flow
FGS/C Flight Guidance System/Computer
FIR Flight Information Region
Fix Position in space usually on aircraft's flight plan
FL Flight Level
FL 310 For example, FL310 is an altitude 31,000 ft. above sea level; used for altitudes above 18,000 ft
FLCH Flight Level Change
FLIDRAS Flight Data Replay and Analysis System
FLT Flight
FMA Flight Mode Annunciator: display on or near the PFDs of the current modes of autoflight system
FMC Flight Management Computer (also FMCS - FMC System)
FMGC Flight Management Guidance Computer
FMGS Flight Management Guidance System
FMS Flight Management System
FO First officer
FOQA Flight Operations Quality Assurance
FPA Flight Path Angle
FPA Focal Plane Array
FPM Feet Per Minute
FQIS Fuel Quantity Indicating System
FR From
FRA Flap Retraction Altitude
FRA Federal Railroad Administration
FREQ Frequency
FSF Flight Safety Foundation
FT Feet
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Terms beginning with G

GA Go-Around
GA General Aviation
GAR Go-Around
GCA Ground-controlled Approach
GDLP Ground Data Link Processor (the Mode S subnetwork function within the ground system that implements the OSI network layer protocols)
GHz Gigahertz
GMT Greenwich MeanTime
GNSS Global Navigation Satellite System
GPS Global Positioning System
GPWS Ground Proximity Warning System (warns of inadequate separation from ground and excessive sink rate close to ground)
GRAF Ground Replay and Analysis Facility
GRP Geographical Reference Points
GS Glide Slope
GS Ground Speed
G/S Glideslope
GSFC Goddard Space Flight Center
GW Gross Weight
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Terms beginning with H

HAC Hughes Aircraft Co.
HAI Helicopter Association International
HBARO Barometric Altitude
HDG Heading
HDG SEL Heading Select
HDOT Inertial Vertical Speed
HE Altitude Error
HF High Frequency
Hl High
HIRS High-Resolution Infrared Sounder
Host Computer Facility located at the ARTCC which operates user application software, as well as certain peer network layer protocols required to communicate with adjacent ATN routers.
Host Processor "End system" as defined by ISO that includes the OSI upper layer protocols (i.e., transport layer and above) and application processes
HP Holding Pattern
HPRES Pressure Altitude
HSI Horizontal Situation Indicator
HUD Head-Up Display
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Terms beginning with I

IA Inspection Authorization
IAOA Indicated Angle-of-Attack
IAS Indicated Airspeed
ICAAS Integrated Control in Avionics for Air Superiority
ICAO International Civil Aviation Organization
ID Identifier
IDENT Identification
IEPR Integrated Engine Pressure Ratio
IF Intermediate Frequency
IFR Instrument Flight Rules
IFRB International Frequency Registration Board
IGFET Insulated Gate Field Effect Transistor
ILS Instrument Landing System (uses precision localizer and glide-slope radio transmitters near a runway to provide landing approach guidance)
IMC Instrument Meteorological Conditions
INBD Inbound
INFO Information
in.hg . inches of mercury
INIT Initialization
INR Image Navigation and Registration
INS Inertial Navigation System
INTC Intercept
IPT Integrated Product Team
IRS Inertial Reference System
IRU Inertial Reference Unit
ISA International Standard Atmosphere
ISO International Standards Organization
ITU International Telecommunications Union
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Terms beginning with J

JAL Japan Air Lines
JAN January
JAR Joint Airworthiness Regulations
JATO Jet Assisted Takeoff
JL Japan Air Lines
JSRA Joint Sponsored Research Agreement
JUL July
JUN June
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Terms beginning with K

KG Kilogram
kHz kilohertz
KLM Royal Dutch Airlines
km Kilometer
KT (kts) Knots
kW Kilowatt
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Terms beginning with L

L Left
LAT Latitude
LAX Identifier for Los Angeles
LCN Local Communications Network.
LFR Low-frequency Radio Range
LIM Limit
LMM Compass locator at the middle marker
LNAV Lateral Navigation (provides computer description of aircraft's planned lateral flight path that can be tracked by the autoflight system; lateral path can be shown on map display.)
LO Low
LOC Localizer Beam
LOE Line Oriented Evaluation
LOFT Line Oriented Flight Training
LOM Compass Locator at the Outer Marker
LON Longitude
LORAN Long Range Navigation
LOS Line-Oriented Simulation
LRC Long Range Cruise
LRU Line Replaceable Unit
LVL CHG Level Change
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Terms beginning with M

M Mach Number
M Manual Tuned NAVAID
MAA Maximum Authorized IFR Altitude
MAG Magnetic
MAINT Maintenance
MAN Manual
MAP Missed Approach
MAR March
M/ASI Mach/Airspeed Indicator
MAX Maximum
MAX CLB Maximum engine thrust for two-engine climb
MAX CRZ Maximum engine thrust for two-engine cruise
MCA Minimum Crossing Altitude
MCDU Multipurpose Control Display Unit
MCP Mode Control Panel (pilots' interface to the autoflight system; usually located centrally just below cockpit glare shield)
MCT Maximum Continuous Thrust
MCW Modulated Continuous Wave
MDA McDonnell-Douglas Aerospace
MDA Minimum Descent Altitude
MDL Multipurpose Data Link
MEA Minimum Enroute Altitude
MEL Minimum Equipment List
MIDAS Man-Machine Integration Design and Analysis System (NASA Ames)
MIDAS Multi-discipline Data Analysis System
MILSPEC Military Specifications
MIN Minutes
MIN Minimum
MIT Massachusetts Institute of Technology
MLA ManeuverLimited Altitude
MLE Landing Gear Extended Placard Mach Number
MLS Microwave Landing System
MMO Mach Max Operating
MN Magnetic North
MOA Memorandum of Agreement
MOCA Minimum Obstruction Clearance Altitude
MOD Modified/Modification
Mode S Type of secondary surveillance radar (SSR) equipment which provides Mode A and Mode C interrogations, discrete address (Mode S) interrogations from the ground or air, and a data link capability
MODIS Moderate-resolution Imaging Spectrometer
MRA Minimum Reception Altitude
MSG Message
MSL Mean Sea Level
MTBF Mean Time Between Failures
MU Management Unit
MWP Meteorological Weather Processor
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Terms beginning with N

N North
NACA National Advisory Committee for Aeronautics
NADIN II National Airspace Data Interchange Network II (the national digital message switching network for aeronautical data)
NAS National Airspace System
NAS National Aircraft Standard
NASA National Aeronautics and Space Administration
N/A Not Applicable
NATCA National Air Traffic Controllers Association
NAV Navigation
NAVAID Navigational Aid
NBAA National Business Aircraft Association
NGATM New Generation Air Traffic Manager
ND Navigation Display
NDB Nondirectional Radio Beacon
NESDIS National Environmental Satellite, Data, and Information Service
NLM Network Loadable Module
NLR National Research Laboratory (The Netherlands)
NM Nautical Mile
NMC National Meteorological Center
NOAA National Oceanic and Atmospheric Administration
NOTAM Notice for Airman
NOV November
NRP National Route Program
NTSB National Transportation Safety Board
NW Northwest Airlines
NWS National Weather Service
Nl Engine Revolutions per Minute (percent)
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Terms beginning with O

OAG Official Airline Guide
OAT Outside AirTemperature
OATS Orbit and Attitude Tracking
OBTEX Offboard Targeting Experiments
OCT October
ODAPS Operational OGE Data Acquisition and Patch Subsystem
OFST Lateral Offset Active Light
OGE Operational Ground Equipment
OIS OGE Input Simulator
OO SkyWest Airlines
OP Operational
OPT Optimum
O-QAR Optical Quick Access Recorder
OSI Open Sytem Interconnection (ISO defined communications architecture used in data link to permit heterogeneous data communication systems to be interconnected in order to allow the reliable exchange of messages without regard to the implementation of the networks and physical media through which the messages pass)
OTFP Operational Traffic Flow Planning
OV Overseas National Airways
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Terms beginning with P

P Procedure-Required Tuned NAVAID
PA Pan Am
PAR Precision Approach Radar
PAWES Performance Assessment and Workload Evaluation
PBD Place Bearing/Distance (way point)
PD Profile Descent
PDB Performance Data Base
PDC Pre Departure Clearance
PERF Performance
PF Pilot Flying
PFD Primary Flight Display
PHARE Program for Harmonized ATC Research in Europe
PHIBUF Performance Buffet Limit
PHINOM Nominal Bank Angle
PIREPS Pilot Reports
PMS Performance Management System
PND Primary Navigation Display
PNF Pilot Not Flying
POS Position
POS INIT Position Initialization
POS REF Position Reference
PPI Plan Position Indicator
PPOS Present Position
PREV Previous
PROC Procedure
PROF Profile
PROG Progress Page on MCDU
PROV Provisional
PS Pacific Southwest Airways
PT Total Pressure
PTH Path
PVD Plan View Display
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Terms beginning with Q

QAR Quick Access Recorder
QRH The barometric pressure as reported by a particular station
QTY Quantity
QUAD Quadrant
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Terms beginning with R

R Right
R Route Tuned NAVAID
RAD Radial
RAD Radio
RAPS Recovery Access Presentation System
RASCAL Rotorcraft Air Crew Systems Concepts Airborne Laboratory
RCP Radio Control Panel
R/C Rate of Climb
RDP Radar Data Processing (system)
REF Reference
REQ Required/Requirement
REQ Request
RESTR Restriction
RESYNCING Resynchronizing
rf radio frequency
RMPs Radio Management Panels
RNAV Area Navigation (generic acronym for any device capable of aircraft guidance between pilot-defined waypoints
RNP Required Navigation Performance
Router An ATN network layer gateway which performs the relaying and routing of data packets across interconnecting subnetworks based on the source and destination network layer addresses and the desired quality of network service
RTA Required Time of Arrival
RTCA Radio Technical Committee on Aeronautics
RTE Route
RVR Runway Visual Range
RW Runway
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Terms beginning with S

S South
SA Situation Awareness
SAS Scandinavian Airlines System
SAT Static Air Temperature
SATCOM Satellite Communications
SBIR Small Business Innovative Research
S/C Step Climb
SEA/TAC Seattle/Tacoma International Airport
SEL Selected
SEP September
SESMA Special Event Search and Master Analysis
SID Standard Instrument Departure
SIGMET Significant Meteorological Information
SITA Société Internationale Télécommunique Aéronautique
SO Southern Airways
SOP Standard Operating Procedure
SOPA Standard Operating Procedure Amplified
SP Space
SPD Speed Mode
SPS Sensor Processing Subsystem
SQL Structured Query Language
SRP Selected Reference Point
SSFDR Solid-State Flight Data Recorder
SSM Sign Status Matrix
STAB Stabilizer
STAR StandardTerminal Arrival Route
STOL Short Takeoff and Landing
STTR Small Business Technology Transfer Resources
SUA Special Use Airspace
SWAP Severe Weather Avoidance Program
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Terms beginning with T

TACAN Tactical Air Navigation
TACH Tachometer
TAI Thermal Anti-lce
TAP Terminal Area Productivity
TAS True Airspeed
TAT Total AirTemperature
TATCA Terminal Air Traffic Control Automaiton
TBD To Be Determined
TBO Time between Overhauls
TBS To Be Specified
TCA Terminal Control Area
TCAS Traffic Alert & Collision Avoidance System
T/C (TOC) Top-of-Climb
T/D (TOD) Top of-Descent
TDWR Terminal Doppler Weather Radar (TDWR located and classifies windshear conditions and provides advisories in the terminal area. These data are available through the DLP.)
TEMP Temperature
TFM Traffic Flow Management
TGT Target
THDG True Heading
THR Thrust
THR HOLD Throttle Hold
TI Texas International
TIAS True Indicated Airspeed
TKE TrackAngle Error
TMA Traffic Management Advisor
TMC Thrust Management Computer
TMF Thrust Management Function
TMU Traffic Management Unit
TN True North
T/O (TO) Takeoff
TOD Top of Descent
TO EPR Takeoff Engine Pressure Ratio
TO Nl Takeoff Engine Fan Speed
TOGA Takeoff/Go-Around
TOT Total
TRA Thrust Reduction Altitude
TRACON Terminal Radar Approach Control Facility.
TRANS Transition
TRK Track (to a NAVAID)
TRU True
TSRV Transport Systems Research Facility
TT Total Temperature
TURB Turbulence
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Terms beginning with U

UA United
UHF Ultra-high Frequency
USAF United States Air Force
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Terms beginning with V

V Velocity
VA Heading to an Altitude
VA Design Maneuvering Speed
VAR Variation
VAR Volt-amps Reactive
VAR Visual-aural Radio Range
VASI Visual Approach Slope Indicator
VBF(LO) Flaps up minimum buffet speed at current maneuver load factor minus altitude dependent variable
VBFNG(HI) High speed CAS at N g's to buffet onset
VBFNG(LO) Low speed CAS at N g's to buffet onset
VCMAX Active Maximum Control Speed
VCMIN Active Minimum Control Speed
VC Design Cruising Speed
VD Design Diving Speed
VD Heading to a DME distance
VF Design Flap Speed
VFE Flaps Extended Placard Speed
VFR Visual Flight Rules
VFXR(R) Flap Retraction Speed
VFXR(X) Flap Extension Speed
VG Ground Velocity
VGND Ground Velocity
VH Maximum Level-flight Speed with Continuous Power
VHF Very-high Frequency
VHRR Very High-Resolution Radiometer
VISSR Visible Infrared Spin Scan Radiometer
Vl Heading to a course intercept
Vls Lowest Selectable Airspeed
VLE Landing Gear Extended Placard Airspeed
VLO Maximum Landing Gear of Operating Speed
VLOF Lift-off Speed
VM Heading to a manual termination
VMC Visual Meteorological Conditions
VMC Minimum Control Speed with Critical Engine Out
VM(LO) Minimum Maneuver Speed
VMAX Basic Clean Aircraft Maximum CAS
VMIN Basic Clean Aircraft Minimum CAS
VMO Velocity Max Operating
VNAV Vertical Navigation (provides computer description of aircraft's speed and altitude that can be tracked by autoflight system)
VNE Never-exceed Speed
VNO Maximum Structural Cruising Speed
VOM Volt-ohm-milliammeter
VOR VHF OmniRange Navigatgion System (ground navigational aid that can provide display of aircraft position relative to course through selected ground navigational radio transmitter)
VORTAC VHF Omni Range Radio/Tactical Air Navagation
VPATH Vertical Path
VR Heading to a radial
VR Takeoff Rotation Velocity
VREF Reference Velocity
VS Design Speed for Maximum Gust Intensity
V/S Vertical Speed/Vertical
VSCS Voice Switching and Control System
VSI Stalling Speed in a Specified Flight Configuration
VSO Stalling Speed in the Landing Configuration
VSTOL Vertical or Short Takeoff and Landing
VTK Vertical Track Distance
VTOL Vertical Takeoff and Landing
V/TRK Vertical Track
VTR Variable Takeoff Rating
VU Utility Speed
VX Speed for Best Angle of Climb
VY Speed for Best Rate of Climb
Vl Critical Engine Failure Velocity (Takeoff Decision Speed)
V2 Takeoff Climb Velocity
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Terms beginning with W

W West
WAAS Wide Area Augmentation System
Waypoint Position in space usually on aircraft's flight plan
WBC Weight and Balance Computer
WINDR Wind Direction
WINDMG Wind Magnitude
WPT Way point
W/MOD With Modification of Vertical Profile
WMSC Weather Message Switching Center
WMSCR Weather Message Switching Center Replacement
WO World Airways
W/STEP With Step Change in Altitude
WT Weight
WX Weather
WXR Weather Radar
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Terms beginning with X

X-BAND The frequency range between 8000 and 12500 MHzXCVR Transceiver
XFR Transfer
XLTR Translater
XM External Master
XMIT Transmit
XMITR Transmitter
XPD ATC Transponder (also XPDR, XPNDR, TPR)
XTK Crosstrack (cross track error)
XY Ryan Air
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Terms beginning with Y

YSAS Yaw Stability Augmentation System
YD Yaw Damper
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Terms beginning with Z

Z Zulu (GMTtime)
ZFW Zero Fuel Weight
ZNY New York Air Route Traffic Control Center
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Last Updated 6/1/11
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